spring之拦截器

2021-08-04 04:23:09

拦截器

实现HandlerInterceptor接口：注册拦截器<mvc:inteceptors>

spring和springMVC父子容器的关系

在spring整体框架的核心概念中，容器是核心思想，就是用来管理Bean的整个生命周期的，而在一个项目中，容器不一定只有一个，spring中可以包括多个容器，而且容器有上下层关系，目前最常见的一种场景就是在项目中引入spring和springmvc两个框架，那么它其实就是两个容器，spring是父容器，springmvc是子容器，并且在spring父容器中注册的bean对于springmvc容器中是可见的，而在springmvc容器中注册的bean对于spring父容器中就是不可见的，也就是子容器可以看见父容器中注册的Bean，反之就不行。

全部拦截：

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 </head>

 <body>

            <form action="${pageContext.request.contextPath }/springmvc/hello" method="post">

          姓名：<input type="text" name="username"><br>

       年龄：<input type="text" name="age"><br>

       <input type="submit" value="提交">

            </form>

 </body>

 </html>

 package com.bjsxt.handlers;

 import java.util.Map;

 import org.springframework.context.annotation.Scope;

 import org.springframework.stereotype.Controller;

 import org.springframework.ui.Model;

 import org.springframework.ui.ModelMap;

 import org.springframework.web.bind.annotation.RequestMapping;

 //后台控制器

 @Controller

 @Scope("prototype")

 @RequestMapping("/springmvc")

 public class MyController{

 //接收json字符串封装成对象

 @RequestMapping("/hello")

 public String hello1(String username,int age,Model model,Map<String,Object>map,ModelMap modelMap){

     System.out.println(username+"______"+age);

     model.addAttribute("username", username);

     System.out.println("MyController.hello1()");

     map.put("age", age);

     modelMap.addAttribute("gender", "female");

     System.out.println("MyController.hello1()");

     return "welcome";

 }

 }

 package com.bjsxt.interceptors;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import org.springframework.web.servlet.HandlerInterceptor;

 import org.springframework.web.servlet.ModelAndView;

 //自定义拦截器

 public class FistInterceptor implements HandlerInterceptor {

     //该方法执行时机：处理器方法执行之前

         @Override

         public boolean preHandle(HttpServletRequest request, HttpServletResponse response,

                 Object handler) throws Exception {

             System.out.println("拦截器执行");

             return false;

         }

     //该方法执行时机：所有方法处理完成执行之后，响应给浏览器客户端执行

     @Override

     public void afterCompletion(HttpServletRequest arg0,

             HttpServletResponse arg1, Object arg2, Exception arg3)

             throws Exception {

         // TODO Auto-generated method stub

     }

     //该方法执行时机：处理器方法执行之后

     @Override

     public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,

             Object arg2, ModelAndView arg3) throws Exception {

         // TODO Auto-generated method stub

     }

 }

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns:context="http://www.springframework.org/schema/context"

    xmlns:mvc="http://www.springframework.org/schema/mvc"

    xmlns:tx="http://www.springframework.org/schema/tx"

    xmlns:aop="http://www.springframework.org/schema/aop"

    xsi:schemaLocation="

        http://www.springframework.org/schema/beans

        http://www.springframework.org/schema/beans/spring-beans.xsd

        http://www.springframework.org/schema/tx

        http://www.springframework.org/schema/tx/spring-tx.xsd

        http://www.springframework.org/schema/aop

        http://www.springframework.org/schema/aop/spring-aop.xsd

        http://www.springframework.org/schema/mvc

        http://www.springframework.org/schema/mvc/spring-mvc.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 注册组件扫描器 -->

    <context:component-scan base-package="com.bjsxt.handlers"></context:component-scan>

    <!-- 注册注解驱动 -->

    <mvc:annotation-driven/>

    <!-- 注册视图解析器 -->

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="/jsp/"></property>

        <property name="suffix" value=".jsp"></property>

    </bean>

        <!-- 注册拦截器 -->

        <mvc:interceptors>

            <mvc:interceptor>

                <mvc:mapping path="/**"/>

                <bean id="" class="com.bjsxt.interceptors.FistInterceptor"></bean>

            </mvc:interceptor>

        </mvc:interceptors>

    <!-- 静态资源无法访问第二种解决方案 -->

    <!-- <mvc:default-servlet-handler/> -->

    <!-- 静态资源无法访问第三种解决方案 -->

    <mvc:resources location="/images/" mapping="/images/**"></mvc:resources>

    <mvc:resources location="/js/" mapping="/js/**"></mvc:resources>

</beans>

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 </head>

 <body>

     欢迎页面！${username}--${age}--${gender}

 </body>

 </html>

指定拦截

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 </head>

 <body>

     <form action="${pageContext.request.contextPath}/springmvc/hello2" method="POST">

         姓名：<input type="text" name="username"><br/>

         年龄：<input type="text" name="age"><br/>

         <input type="submit" value="提交"><br/>

     </form>

 </body>

 </html>

 package com.bjsxt.handlers;

 import java.util.Map;

 import org.springframework.context.annotation.Scope;

 import org.springframework.stereotype.Controller;

 import org.springframework.ui.Model;

 import org.springframework.ui.ModelMap;

 import org.springframework.web.bind.annotation.RequestHeader;

 import org.springframework.web.bind.annotation.RequestMapping;

 //后端控制器

 @Controller

 @Scope("prototype")

 @RequestMapping("/springmvc")

 public class MyController{

     @RequestMapping("/hello")

     public String  hello1(String username,int age,Model model,Map<String, Object> map,ModelMap modelMap){

         System.out.println(username + " ----------"+age);

         model.addAttribute("username", username);

         map.put("age", age);

         modelMap.addAttribute("gender", "female");

         return "welcome";

     }

     @RequestMapping("/hello2")

     public String  hello2(String username,int age,Model model,Map<String, Object> map,ModelMap modelMap){

         System.out.println(username + " 2222----------2222"+age);

         model.addAttribute("username", username);

         map.put("age", age);

         modelMap.addAttribute("gender", "female");

         return "welcome";

     }

 }

 package com.bjsxt.interceptors;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import org.springframework.web.servlet.HandlerInterceptor;

 import org.springframework.web.servlet.ModelAndView;

 //自定义拦截器

 public class FirstInterceptor implements HandlerInterceptor {

     //该方法执行时机：处理器方法执行之前执行

     @Override

     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)

             throws Exception {

         System.out.println("拦截器preHandle（）执行！");

         return true;

     }

     //该方法执行时机：处理器方法执行之后执行

     @Override

     public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,

             ModelAndView modelAndView) throws Exception {

         System.out.println("拦截器postHandle()执行！");

     }

     //该方法执行时机：所有工作处理完成之后，响应给浏览器客户端之前执行

     @Override

     public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)

             throws Exception {

         System.out.println("拦截器afterCompletion()执行！");

     }

 }

 <?xml version="1.0" encoding="UTF-8"?>

 <beans xmlns="http://www.springframework.org/schema/beans"

     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

     xmlns:context="http://www.springframework.org/schema/context"

     xmlns:mvc="http://www.springframework.org/schema/mvc"

     xmlns:tx="http://www.springframework.org/schema/tx"

     xmlns:aop="http://www.springframework.org/schema/aop"

     xsi:schemaLocation="

         http://www.springframework.org/schema/beans

         http://www.springframework.org/schema/beans/spring-beans.xsd

         http://www.springframework.org/schema/tx

         http://www.springframework.org/schema/tx/spring-tx.xsd

         http://www.springframework.org/schema/aop

         http://www.springframework.org/schema/aop/spring-aop.xsd

         http://www.springframework.org/schema/mvc

         http://www.springframework.org/schema/mvc/spring-mvc.xsd

         http://www.springframework.org/schema/context

         http://www.springframework.org/schema/context/spring-context.xsd">

     <!-- 注册组件扫描器 -->

     <context:component-scan base-package="com.bjsxt.handlers"></context:component-scan>

     <!-- 注册注解驱动 -->

     <mvc:annotation-driven/>

     <!-- 注册视图解析器 -->

     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

         <property name="prefix" value="/jsp/"></property>

         <property name="suffix" value=".jsp"></property>

     </bean>

     <!-- 注册拦截器 -->

     <mvc:interceptors>

         <mvc:interceptor>

             <mvc:mapping path="/springmvc/hello"/>

             <mvc:mapping path="/**"/>

             <mvc:exclude-mapping path="/springmvc/hello2"/>

             <bean id="" class="com.bjsxt.interceptors.FirstInterceptor"></bean>

         </mvc:interceptor>

     </mvc:interceptors>

     <!-- 静态资源无法访问第二种解决方案 -->

     <!-- <mvc:default-servlet-handler/> -->

     <!-- 静态资源无法访问第三种解决方案 -->

     <mvc:resources location="/images/" mapping="/images/**"></mvc:resources>

     <mvc:resources location="/js/" mapping="/js/**"></mvc:resources>

 </beans>

码农公寓

拦截器

spring和springMVC父子容器的关系

指定拦截

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